In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is in the KEV database since Nov. 3, 2021.

The EPSS score is 0.9444.

Exploitation active

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Atlassian Confluence Server affected
Version Status Constraints
unspecified affected
< 6.13.23
6.14.0 affected
< unspecified
unspecified affected
< 7.4.11
7.5.0 affected
< unspecified
unspecified affected
< 7.11.6
7.12.0 affected
< unspecified
unspecified affected
< 7.12.5
Atlassian Confluence Data Center affected
Version Status Constraints
unspecified affected
< 6.13.23
6.14.0 affected
< unspecified
unspecified affected
< 7.4.11
7.5.0 affected
< unspecified
unspecified affected
< 7.11.6
7.12.0 affected
< unspecified
unspecified affected
< 7.12.5

Configuration 1 [-]

OR cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*

No data.

No data.

Subscriptions

Vendors Products
Atlassian Subscribe
Confluence Data Center Subscribe
Confluence Server Subscribe

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html cve-icon cve-icon
https://jira.atlassian.com/browse/CONFSERVER-67940 cve-icon cve-icon
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26084 cve-icon cve-icon
History

Wed, 17 Dec 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'rapid', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 17 Dec 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'rapid', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 17 Dec 2025 09:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'rapid', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 17 Dec 2025 08:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'rapid', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 17 Dec 2025 05:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'rapid', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 22 Oct 2025 00:30:00 +0000

Type Values Removed Values Added
References

Tue, 21 Oct 2025 20:30:00 +0000

Type Values Removed Values Added
References

Tue, 21 Oct 2025 19:30:00 +0000

Type Values Removed Values Added
References

Wed, 30 Jul 2025 02:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'rapid', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 04 Feb 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2021-11-03'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}
cve-icon MITRE

Status: PUBLISHED

Assigner: atlassian

Published:

Updated: 2025-12-16T18:04:05.834Z

Reserved: 2021-01-25T00:00:00.000Z

Link: CVE-2021-26084

cve-icon Vulnrichment

Updated: 2024-08-03T20:19:19.592Z

cve-icon NVD

Status : Analyzed

Published: 2021-08-30T07:15:06.587

Modified: 2025-10-24T13:38:44.590

Link: CVE-2021-26084

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses